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Gas chromatography carbon isotope ratio mass spectroscopy of a GRA 95229 unhydrolyzed water extract showing the elution of isoleucine and alloisoleucine enantiomers (a), an alloisoleucine/isoleucine standard (b), and their δ13C values. m/z traces 44, 45, and 46, on a Cirasil-Dex column. Prior GC-MS analyses of the sample showed that elutions of the four meteoritic diasteromers were free of interference. A more extended chromatogram is shown in SI Fig. 4.
